86664881 has 2 divisors, whose sum is σ = 86664882. Its totient is φ = 86664880.

The previous prime is 86664859. The next prime is 86664883. The reversal of 86664881 is 18846668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84474481 + 2190400 = 9191^2 + 1480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86664881 is a prime.

It is a super-2 number, since 2×86664881² = 15021603197488322, which contains 22 as substring.

Together with 86664883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (86664883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43332440 + 43332441.

It is an arithmetic number, because the mean of its divisors is an integer number (43332441).

Almost surely, 2^86664881 is an apocalyptic number.

It is an amenable number.

86664881 is a deficient number, since it is larger than the sum of its proper divisors (1).

86664881 is an equidigital number, since it uses as much as digits as its factorization.

86664881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 442368, while the sum is 47.

The square root of 86664881 is about 9309.3974563341. The cubic root of 86664881 is about 442.5350920705.

The spelling of 86664881 in words is "eighty-six million, six hundred sixty-four thousand, eight hundred eighty-one".